Worn Out Retina, A Big Problem?

I went to get glasses today and the doctor told me that I have a part on my retina that is worn out; he explained that this is normal in people with astigmatism. He did warn me that if I ever start seeing white flashes or constant floaters that I should go back to him as soon as possible. He gave me the feeling this was not such a big deal, but I am still scare that I could get a detached retina; he did say that there is a 1% chance of this happening. I am very unlucky and I am scared. Should I be worried? Should I look for another doctor, maybe there is a treatment to prevent the actual detachment or any further worn out of my retina.
Please give me some advice.